TY - GEN
T1 - Fabrication of high-performance organic thin-film transistor arrays and application to 5-inch flexible displays
AU - Fujisaki, Y.
AU - Takei, T.
AU - Nakajima, Y.
AU - Sato, H.
AU - Suzuki, M.
AU - Fukagawa, H.
AU - Motomura, G.
AU - Kumaki, D.
AU - Yamamoto, T.
AU - Fujikake, H.
AU - Kurita, T.
AU - Tokito, S.
PY - 2010
Y1 - 2010
N2 - We have demonstrated a 5-inch flexible color liquid crystal display (LCD) and organic light emitting display (OLED) driven by low-voltage-operation organic thin-film transistors (OTFTs). To achieve high-quality and high-resolution moving images, OTFTs with high performance, for example, high mobility, high ON/OFF ratio, low sub-threshold slope (SS), and low operating voltage, have been developed. We fabricated pentacene-based low-voltage OTFTs with a Ta2O5 gate dielectric prepared in a low-temperature process. The resulting OTFT array showed a high mobility of 0.3-0.4 cm 2/Vs, an ON/OFF ratio over 107, VT of 2.7 V, and low SS at 0.3 V/decade. OTFTs with solution-processable materials such as fluoropolymer gate dielectric and liquid-crystalline semiconducting polymers, PBTTT, were also investigated. The electrical characteristics and stabilities of these devices, as well as a demonstration of OTFT-driven flexible displays, are discussed. Both the flexible LC device and the OLED device were successfully fabricated on the pentacene-based OTFT arrays. Printing and lamination techniques were introduced to assemble the flexible LC device. Phosphorescent polymer materials, which can be patterned by ink-jet printing, were used for the emitting layer of the OLED. Color moving images were successively shown on the resulting 5-inch displays using an active-matrix driving technique of the OTFT at a low driving voltage of 15 V.
AB - We have demonstrated a 5-inch flexible color liquid crystal display (LCD) and organic light emitting display (OLED) driven by low-voltage-operation organic thin-film transistors (OTFTs). To achieve high-quality and high-resolution moving images, OTFTs with high performance, for example, high mobility, high ON/OFF ratio, low sub-threshold slope (SS), and low operating voltage, have been developed. We fabricated pentacene-based low-voltage OTFTs with a Ta2O5 gate dielectric prepared in a low-temperature process. The resulting OTFT array showed a high mobility of 0.3-0.4 cm 2/Vs, an ON/OFF ratio over 107, VT of 2.7 V, and low SS at 0.3 V/decade. OTFTs with solution-processable materials such as fluoropolymer gate dielectric and liquid-crystalline semiconducting polymers, PBTTT, were also investigated. The electrical characteristics and stabilities of these devices, as well as a demonstration of OTFT-driven flexible displays, are discussed. Both the flexible LC device and the OLED device were successfully fabricated on the pentacene-based OTFT arrays. Printing and lamination techniques were introduced to assemble the flexible LC device. Phosphorescent polymer materials, which can be patterned by ink-jet printing, were used for the emitting layer of the OLED. Color moving images were successively shown on the resulting 5-inch displays using an active-matrix driving technique of the OTFT at a low driving voltage of 15 V.
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M3 - Conference contribution
AN - SCOPUS:77957788638
SN - 9781617387555
T3 - Materials Research Society Symposium Proceedings
SP - 19
EP - 30
BT - Large-Area Processing and Patterning for Optical, Photovoltaic and Electronic Devices - 2009
T2 - 2009 MRS Fall Meeting
Y2 - 30 November 2009 through 4 December 2009
ER -